Hi congratz on your game :) It is a really good concept idea... But I think that to explode the mushrooms they should grow at least like 50% of full size... I was able to 'glitch' it by spaming SHIFT+LMB right in front of ants to kill they xD
Maybe add life to ants, and when exploding a mushroom at 10% of max size it give like 10% of total dmg... It its 100% growed it does 200% dmg (extra dmg).. and if its 50% it does 50~100%, something like that..
You could add some more mushrooms styles too, would be nice to see some eletric, poisonous etc types of mushrooms :)
If you have the time please play my game and give me your honest feedback :)